Potential for Energy Conservation by a Hybrid Natural Lighting System with LED Illumination

Abstract

In buildings, efficient lighting systems and excellent design of interior natural light illumination would contribute to energy saving by direct use solar energy for illumination. This paper propose a model of hybrid natural lighting system with LEDs illumination that would be improve the efficiency of solar energy use. The system is compounded by a prismatic daylight collector, a reflector for re-directing daylight into the room and a diffuse reflector for indoor illumination. The main emerged intensity distribution of the right-angle prismatic collector was investigated using matrix ray tracing model and edge ray principle. The directionality of main emerged light from hypotenuse of the prism is applied to effort the performance of natural light illumination systems by simply guiding design. In this paper, we propose that an efficient hybrid natural lighting system with LED which combined with the prismatic daylight collector can be realizable by a suitable tilted angle of the prismatic daylight collector for different daylight conditions. The reduced electrical energy consumption for using hybrid natural lighting system with LED illumination system can contribute to 70%, 61% and 40% compared to using T8 fluorescent, T5 fluorescent and LEDs, respectively.